In a set of reactions acetic acid yielded a product $\mathrm{D}$

${\mathrm{CH}}_3\mathrm{COOH}⟶{\mathrm{SOCl}}_2\stackrel{{\mathrm{SOCl}}_2}{\to }\mathrm{A}\underset{\mathrm{Anhy}. {\mathrm{AlCl}}_3}{\overset{\mathrm{Benzene}}{\to }}\mathrm{B} \stackrel{\mathrm{HCN}}{⟶}\mathrm{C}\stackrel{{\mathrm{H}}_3{\mathrm{O}}^{\oplus }}{\to }\mathrm{D}$

What would be the structure of $\mathrm{D}$?

What is the correct reactivity order of decarboxylation?